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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/metrics/desktop_session_duration/audible_contents_tracker.h"
#include "chrome/browser/metrics/desktop_session_duration/desktop_session_duration_tracker.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_list.h"
#include "chrome/browser/ui/recently_audible_helper.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
namespace metrics {
AudibleContentsTracker::AudibleContentsTracker(Observer* observer)
: observer_(observer) {
BrowserList* browser_list = BrowserList::GetInstance();
for (Browser* browser : *browser_list)
browser->tab_strip_model()->AddObserver(this);
browser_list->AddObserver(this);
}
AudibleContentsTracker::~AudibleContentsTracker() {
BrowserList::GetInstance()->RemoveObserver(this);
}
void AudibleContentsTracker::OnBrowserAdded(Browser* browser) {
browser->tab_strip_model()->AddObserver(this);
}
void AudibleContentsTracker::OnBrowserRemoved(Browser* browser) {
browser->tab_strip_model()->RemoveObserver(this);
}
void AudibleContentsTracker::OnTabStripModelChanged(
TabStripModel* tab_strip_model,
const TabStripModelChange& change,
const TabStripSelectionChange& selection) {
if (change.type() == TabStripModelChange::kRemoved) {
for (const auto& contents : change.GetRemove()->contents) {
if (contents.remove_reason == TabStripModelChange::RemoveReason::kDeleted)
RemoveAudibleWebContents(contents.contents);
}
} else if (change.type() == TabStripModelChange::kReplaced) {
auto* replace = change.GetReplace();
if (replace->old_contents)
RemoveAudibleWebContents(replace->old_contents);
if (replace->new_contents) {
auto* audible_helper =
RecentlyAudibleHelper::FromWebContents(replace->new_contents);
if (audible_helper->WasRecentlyAudible())
AddAudibleWebContents(replace->new_contents);
}
}
}
void AudibleContentsTracker::TabChangedAt(content::WebContents* web_contents,
int index,
TabChangeType change_type) {
// Ignore 'loading' and 'title' changes.
if (change_type != TabChangeType::kAll)
return;
auto* audible_helper = RecentlyAudibleHelper::FromWebContents(web_contents);
if (audible_helper->WasRecentlyAudible())
AddAudibleWebContents(web_contents);
else
RemoveAudibleWebContents(web_contents);
}
void AudibleContentsTracker::AddAudibleWebContents(
content::WebContents* web_contents) {
// The first web contents to become audible indicates that audio has started.
bool added = audible_contents_.insert(web_contents).second;
if (added && audible_contents_.size() == 1)
observer_->OnAudioStart();
}
void AudibleContentsTracker::RemoveAudibleWebContents(
content::WebContents* web_contents) {
// If the web content was previously audible and there are no other audible
// web contents then notify that audio ended.
bool removed = (audible_contents_.erase(web_contents) == 1);
if (removed && audible_contents_.empty())
observer_->OnAudioEnd();
}
} // namespace metrics
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